Syringe.



No. 812,686. PATBNTBD FEB.`13,'1906. H. T. SGHQRK L P. A. STAHL.

'SYRINGR .AFPLICATION FILED JULY 13,1905.

W/TNESSES.'

videdv with a cireumferentia UNITED sTATEs ilATENT oEEicE' HENRY T. SCHORK AND FREDERICK ATEZI-AHL, OF NEW YORK', N. Y.

i sYmNGE. i

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed July 13, 1 905. Serial N0. 269,468.

To all whom it may concern,.-

Be it known that We, HENRY T. SGHOEK and FREDERICK A. STAHL, citizens of the United States, and residents of New York. in the county of New York and State of New York, have invented certain new and useful Improvements in Syringes, of which the following is a specification.

Our invention relates to syringes, particularly to syringes for inj ecting liquid medicant.

It has for its object to provide a syringe the piston of which is hollow and adapted I. to serve as a bottle for containing liquid medicant, to deliver it therefrom into the barrel in measured quantities, or to draw it therein again from the barrel.

It has for a further object to ,provide a device of the character set forth embodying advantages in point of easy and perfect operation, simplicity and inexpensiveness 'of construction, lightness, and compactness.

' In the drawings, Figure 1 is a vertical sectional View of the syringe; Fig. 2, a side view of the piston, and Fig. 3 a side View of the barrel.

A In all the figures of the drawings illustrating my invention like reference characters designate corres ending parts,

Referring to t e drawings, 1 designates the piston, which is formed of a tube ada ted to contain liquid Inedicant, the upper en of said tube being closed by a sto per 2 and proliange 3, to be grasped between the lingers and the lower end thereof reduced and provided with a small opening 4 and a circumferential groove 5, having a flexible resilient packing-ring 6 therein provided with rounded faces. The barrel 7, in which the piston is rcciprocally located, is formed of a tube adapted -to receive the liquid medicant from the piston in such quantity as it is desired to inject, the upper end of said tube being open for the insertion of the piston and )rovided with a circumferential flange 8, to e grasped between the fingers and the lower end thereof reduced to form a nozzle having a small o ening 9 and adapted to receive'a ca 10 of ru ber or other flexible elastic materia While we preferably make thev piston and valve of our syringe of glass, so that its operation may be observed and also for vsanitary reasons, it ma be made of rubber or other suitable material.

The diameter of the ring 6 is greater'than that of the interior of the barrel 7, and for this reason and that thering is thin, flexible, and has rounded faces when the piston 1 is moved the edges of the vring will be turned over in the opposite direction to the movement of said piston, thereby effecting a close yielding contact with the interior surface of the barrel, yet allowing the piston to be easily and readily moved.

It will be understood that this syringe will alsoserve as an ordinary syringe by permanently retaining the stopper in the upper end vof the piston, in which case the liquid will be drawn into the barrel by pulling the piston outwardly and forced therefrom by pushing it in wardly.

The operation is as follows: The parts being in the'position shown by Fig. 1 of the drawings, the stopper is removed and li uidI medicant is poured into the piston, andw ile the stopper is out of the piston it is pulled up wardly until the required amount of me icant has been drawn therefrom into the bar rel. The stop er is then vplaced in again, the cap removed rom the nozzle, and the piston ressed down', which has the effect of forcing the li uid through the nozzle. lf the piston is pul ed upwardly while the stopper is out, any medicant left in the b arrel will h ey returned to said piston. The cap can then be placed on,

the nozzle and the piston pushed in.

We do not wishto be understood as limiting ourselves to the precise details and arf rangements of parts shown and described., but reserve the right to all modifications within the scope of our invention.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is

In a syringe, the'coinbination with a hollow cylindrical barrel, the upper end of said barrel being open and the lower end reduced to provide a nozzle having a small opening,

of a hollow cylindricalpiston reciprocally lo-" cated within said barrel and spaced therefrom, the upper end of said piston being open,

a4 stopper for said o pen end of the piston, theiston reduced to provide a lower end of said small yopeningen a circumferential groove, said piston being adapted to contain a liquid inedicant which upon outward reciprocation of the piston, the stopper beingremoved, flows .into-the barrel in front of the piston in osition to be l'orced out of the nozzle by an inward reciprocation of the pist-on, a thin `flexible resilient paeking-ringseat-ed in said groove and spacing the piston fromy the barrel, said ring having convex upper and. lower l York and State of New faces and a, sharp circumferential ed Ue, one of said faces ada ted. to bear against bhe eliteH rior surfaced the piston and the other face l against, the interior 'surface of the barrel when the piston is reeproeated inwardly, substantially as described. Signed at New York, in the county of New York, this 21st day of une, A. D. 1905.

HENR Yk T. SCHORK. FREDERICK A. STAHL.

VJitnesees: e

CHAS. LVVULF, i ALBERT ELACKWOOE. 

